The story concept comes from the idea that the world we are living in now is actually a fake, digital world created by someone else. The story is inspired by the movie The Island (2005), talking about how people found out that they are actually clones of real people, so they try to run away from the island in order to find their own life.
Many movies have this similar concept in their story.
Also, Elon Musk once said that “There’s a billion to one chance we’re living in base reality.” that has the same concept that we are living in a fake world.